Semi-automated segmentation of the prostate gland boundary in ultrasound images using a machine learning approach
2008
This paper presents a semi-automated algorithm for prostate boundary segmentation from three-dimensional (3D)
ultrasound (US) images. The US volume is sampled into 72 slices which go through the center of the prostate gland and
are separated at a uniform angular spacing of 2.5 degrees. The approach requires the user to select four points from slices
(at 0, 45, 90 and 135 degrees) which are used to initialize a discrete dynamic contour (DDC) algorithm. 4 Support Vector
Machines (SVMs) are trained over the output of the DDC and classify the rest of the slices. The output of the SVMs is
refined using binary morphological operations and DDC to produce the final result. The algorithm was tested on seven
ex vivo 3D US images of prostate glands embedded in an agar mold. Results show good agreement with manual
segmentation.
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